@Mirian Romanovich -
Welcome to the Community.
You will need to have the JSM project's Admin access by adding yourself as the project's Administrator role. Afterward, you should be able to update the Reporter field by accessing the issue via the browse project issue UI (Note - this is not the portal issue UI).
I am assuming you are asking to change the existing reporter value of an existing issue.
Hope this helps.
Best, Joseph Chung Yin
Jira/JSM Functional Lead, Global Infrastructure Applications Team
Viasat Inc.
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